I feel that it is worth it. If you choose Techron get the large bottle for treating 20 gallons, unless your tank(s) is larger of course. Dump it in & fill 'er up every oil change.
I now use FP60 at every fill up. It is only 1 ounce per five gallons so it is very cost effective. More information is available here:
http://www.lubecontrol.com/
I have no affiliation, just letting you know about a good product. It continually cleans and both of our cars had an increase in MPG. One increased by 1 MPG, the other 1.5. It's easily checked.....stop using it and the MPG drops by the same amount.
As far as the brake fluid goes, it IS a good idea to flush the system every 30K or so. The fluid gets contaminated and needs to be replaced. Some ABS systems are particularly sensitive to dirty brake fluid........Honda comes to mind.